Opponents of the embattled Willets Point project near Citi Field say the city should have revealed that the Mets’ owners proposed building a casino next to the stadium.

“The fact that the casino plan was hidden from the public for so long shows there’s much more than they’re letting on here,” said local activist Alfredo Centola, referring to yesterday’s Post story.

Others said they fear that the casino plan — which the city axed from a 2011 proposal by team owner Fred Wilpon’s Sterling Equities development operation — could be added back.

Assembly Speaker Sheldon Silver is receptive to a casino near the stadim, the state Legislature is considering an amendment to allow Vegas-style gaming in New York, and Mayor Bloomberg will be out of office next year.

A city spokesman said, “The agreement [with the developers] to clean up and transform this long-blighted area into a dynamic, mixed-use district expressly prohibits any gaming uses.”

“We look forward to continuing the public approvals process for this critical project that will remediate over 20 acres of toxic land and create thousands of jobs, hundreds of affordable housing units, and billions in economic activity”